ZFS unable to import pool

[Gena Guchin]

Johan, 

Looking though the history, i DID add that disk ada7 (!) to the pool, but I added it as a separate disk. I wanted to re-add the disk to the storage pool, but it added as a new disk…
this does help a lille..


anything I can do now? 
can I remove that vdev?


thanks!
On Apr 23, 2014, at 3:18 AM, Johan Hendriks <joh.hendriks at gmail.com> wrote:

> 
> op 23-04-14 12:01, Hugo Lombard schreef:
>> Hello
>> 
>> In your original 'zpool import' output, it shows the following:
>> 
>>        Additional devices are known to be part of this pool, though their
>>        exact configuration cannot be determined.
>> 
>> I'm thinking your problem might be related to devices that's supposed to
>> be part of the pool but that's not shown in the import.
>> 
>> For instance, here's my attempt at recreating your scenario:
>> 
>>   # zpool import
>>      pool: t
>>        id: 15230454775812525624
>>     state: DEGRADED
>>    status: One or more devices are missing from the system.
>>    action: The pool can be imported despite missing or damaged devices.  The
>> 	  fault tolerance of the pool may be compromised if imported.
>>      see: http://illumos.org/msg/ZFS-8000-2Q
>>    config:
>>   	  t                        DEGRADED
>> 	    raidz1-0               DEGRADED
>> 	      md3                  ONLINE
>> 	      md4                  ONLINE
>> 	      md5                  ONLINE
>> 	      md6                  ONLINE
>> 	      3421664295019948379  UNAVAIL  cannot open
>> 	  cache
>> 	    md1s2
>> 	  logs
>> 	    md1s1                  ONLINE
>>   #
>> 
>> As you can see, the pool stattus is 'DEGRADED' instead of 'UNAVAIL', and
>> I don't have the 'Additional devices...' message.
>> 
>> The pool imports OK:
>> 
>>   # zpool import t
>>   # zpool status t
>>     pool: t
>>    state: DEGRADED
>>   status: One or more devices could not be opened.  Sufficient replicas exist for
>> 	  the pool to continue functioning in a degraded state.
>>   action: Attach the missing device and online it using 'zpool online'.
>>      see: http://illumos.org/msg/ZFS-8000-2Q
>>     scan: none requested
>>   config:
>>   	  NAME                     STATE     READ WRITE CKSUM
>> 	  t                        DEGRADED     0     0     0
>> 	    raidz1-0               DEGRADED     0     0     0
>> 	      md3                  ONLINE       0     0     0
>> 	      md4                  ONLINE       0     0     0
>> 	      md5                  ONLINE       0     0     0
>> 	      md6                  ONLINE       0     0     0
>> 	      3421664295019948379  UNAVAIL      0     0     0  was /dev/md7
>> 	  logs
>> 	    md1s1                  ONLINE       0     0     0
>> 	  cache
>> 	    md1s2                  ONLINE       0     0     0
>>      errors: No known data errors
>>   #
>> 
>> As a further test, let's see what happens when the cache disk
>> disappears:
>> 
>>   # zpool export t
>>   # gpart delete -i 2 md1
>>   md1s2 deleted
>>   # zpool import
>>      pool: t
>>        id: 15230454775812525624
>>     state: DEGRADED
>>    status: One or more devices are missing from the system.
>>    action: The pool can be imported despite missing or damaged devices.  The
>> 	  fault tolerance of the pool may be compromised if imported.
>>      see: http://illumos.org/msg/ZFS-8000-2Q
>>    config:
>>   	  t                        DEGRADED
>> 	    raidz1-0               DEGRADED
>> 	      md3                  ONLINE
>> 	      md4                  ONLINE
>> 	      md5                  ONLINE
>> 	      md6                  ONLINE
>> 	      3421664295019948379  UNAVAIL  cannot open
>> 	  cache
>> 	    7736388725784014558
>> 	  logs
>> 	    md1s1                  ONLINE
>>   # zpool import t
>>   # zpool status t
>>     pool: t
>>    state: DEGRADED
>>   status: One or more devices could not be opened.  Sufficient replicas exist for
>> 	  the pool to continue functioning in a degraded state.
>>   action: Attach the missing device and online it using 'zpool online'.
>>      see: http://illumos.org/msg/ZFS-8000-2Q
>>     scan: none requested
>>   config:
>>   	  NAME                     STATE     READ WRITE CKSUM
>> 	  t                        DEGRADED     0     0     0
>> 	    raidz1-0               DEGRADED     0     0     0
>> 	      md3                  ONLINE       0     0     0
>> 	      md4                  ONLINE       0     0     0
>> 	      md5                  ONLINE       0     0     0
>> 	      md6                  ONLINE       0     0     0
>> 	      3421664295019948379  UNAVAIL      0     0     0  was /dev/md7
>> 	  logs
>> 	    md1s1                  ONLINE       0     0     0
>> 	  cache
>> 	    7736388725784014558    UNAVAIL      0     0     0  was /dev/md1s2
>>      errors: No known data errors
>>   #
>> 
>> So even with a missing raidz component and a missing cache device, the
>> pool still imports.
>> 
>> I think some crucial piece of information is missing to complete the
>> picture.
>> 
> Did you in the past add an extra disk to the pool?
> This could explain the whole issue as the pool is missing a whole vdev.
> 
> regards
> Johan
> 
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